<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>


<script>
  //定义json
  var json = {
    "name":"zhangsan",
    "age":23,
    "addr":["北京","上海","西安"]
  };

  //获取值
  document.write(json.addr);
</script>

</body>
</html>